Road-traffic stud



FIG. 1 is a side elevation of a road-traffic stud according to my new design;

FIG. 2 is a top-plan view;

FIG. 3 is a perspective view on a reduced scale;

FIG. 4 is an inverted-plan view; and

FIG. 5 is a sectional view taken along the line V--V in FIG. 4. 

The ornamental design for a road-traffic stud, as shown and described. 